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Ion mass dependence of irradiation-induced damage accumulation in KTaO3

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Abstract

Damage production and amorphization resulting from the interaction of medium-energy (from 40 to 480 keV) noble-gas ions (from He to Kr) with potassium tantalate (KTaO3) are determined using ion channeling measurements. A disorder accumulation model has been fit to the maximum damage concentration versus ion fluence to extract the cross sections for direct-impact and defect-stimulated amorphization, and the results indicate that defect-stimulated amorphization is the dominant mechanism. These cross sections exhibit a strong dependence on the calculated cross sections for displacing lattice atoms, indicating a dominant contribution of nuclear interactions to the defect production and amorphization processes under the irradiation conditions used in this study. These experimental findings, along with the model fits, suggest that the difference in recoil spectra between He and the other heavier ions may be the main driving force for the decreased damage efficiency observed for He ions, which results in a reduced rate of damage accumulation.

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Acknowledgements

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under Contract DE-AC05-00OR22725. The work was also supported by the BMBF of Germany under Contract No. 03SF0478B. The authors gratefully acknowledge the staff of the ion beam center facility at Friedrich-Schiller Universität Jena for their assistance during ion irradiation and ion channeling experiments.

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Authors and Affiliations

  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Gihan Velişa, Yanwen Zhang & William J. Weber

  2. Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany

    Elke Wendler

  3. School of Physics and Technology, University of Jinan, Jinan, 250022, People’s Republic of China

    Liang-Ling Wang

  4. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, People’s Republic of China

    Liang-Ling Wang

  5. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    William J. Weber

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  1. Gihan Velişa
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  2. Elke Wendler
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  3. Liang-Ling Wang
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  4. Yanwen Zhang
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  5. William J. Weber
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Correspondence to William J. Weber.

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Note of Copyright: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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Velişa, G., Wendler, E., Wang, LL. et al. Ion mass dependence of irradiation-induced damage accumulation in KTaO3. J Mater Sci 54, 149–158 (2019). https://doi.org/10.1007/s10853-018-2864-5

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  • DOI: https://doi.org/10.1007/s10853-018-2864-5

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